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Right bundle branch block (RBBB) occurs when there is a delay or blockage along the electrical conduction pathway of the right bundle branch, which is responsible for carrying electrical impulses to the right side of the heart. The correct answer highlights that electrical conduction issues are a primary cause of RBBB. These types of conditions can stem from several underlying factors, such as congenital abnormalities, degenerative changes in the heart's conductive system, and other electrical disturbances.

While high blood pressure, heart failure, and coronary artery disease are significant cardiovascular conditions that can lead to various heart problems, they are not direct causes of right bundle branch block. Instead, they may present as complications or associated conditions. For instance, chronic high blood pressure can lead to structural changes in the heart over time, potentially contributing to heart failure or other electrical issues. However, it is the specific disruption in the electrical signaling within the right bundle branch itself that definitively correlates with the manifestation of RBBB. Therefore, recognizing that electrical conduction issues are at the core of this condition is critical for understanding its pathophysiology.